I need to find a great ob/gyn near allen!!?

I'm pregnant with my 3rd child right now but haven't seen an ob/gyn yet. I just moved to Allen from Arlington so I have no idea where to find a reliable doctor. I had the same doctor for my 1st two kids and he was an awesome doctor, I'm afrad I won't be able to find one just as great! Also, I have medicaid and it's hard to find one that accepts it. I heard the Plano Presby hospital is highly recommended for the delivery, I just need to find the doctor now! I've tried to find ratings on some of the doctors I've called, but that's also hard to find. Any suggestions?